Is echo guide foam sclerotherapy safe in treating perforator vein problem with history of PE?

Massive PE in 2014. Likely caused by birthcontrol. Discontinued them.No longer on any blood thinners. Pain in left leg on shin since dec.2015. Had VNUS of left upper leg in february. Didnt help. Had sclerotherapy in april. Didnt help. 2nd opinion in vein clinic. They say 3 varicose veins caused by defect perforator vein. They want to give my echo guided Foam sclero with 7 days of fragmin (blood thinner) injections. Is this safe in my case? Can the foam leak into deep system from perforator vein?

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